挠性航天器大角度机动的滑模变结构控制

Sliding Mode Variable Structure Control for Large Angle Maneuvering of Flexible Spacecraft

考虑刚性主体上带有挠性梁的航天器,在建立挠性系统动力学模型的基础上,采用指数趋近率的滑模变结构控制策略进行大角度机动控制,并通过最优控制理论设计弹性稳态器抑制由于刚体运动而激发的弹性振动。数字仿真表明,提出的控制策略在实现旋转机动的同时,有效地抑制了弹性振动。

This paper is concerned with large angle slew maneuvering of flexible spacecraft, consisting of a rigid central body and a flexible beam. The dynamic model is derived from the assumption mode method. The sliding mode variable structure control(VSC) method is applied to drive slew maneuvering. To suppress the simultaneous elastic vibration in movement, an elastic stabilizer is designed by using the LQR control method. Numerical simulation results are presented to show the effectiveness of the proposed control strategy.